NEW YORK (AP) – CBS maintained its winning ways for a 12th week, eclipsing its rivals and building on its unbroken record this season.

The network claimed six of the top 10 shows last week, with “CSI: Crime Scene Investigation” in first place with a huge viewership of 30.9 million, according to Nielsen Media Research. “Without a Trace” ranked second.

The season finish for “Survivor: Guatemala” (the eighth cycle for this durable reality series) took third place, drawing the biggest audience for a “Survivor” finale since “Survivor: All Stars” in May 2004. A regular “Survivor” episode ranked fourth, with “60 Minutes” coming in fifth.

NBC’s top show was “Law & Order: Special Victims Unit,” in sixth place.

ABC’s biggest show was its red-hot hospital drama, “Grey’s Anatomy,” ranked seventh, while the umpteenth repeat of “A Charlie Brown Christmas” ranked eighth.

For the week, CBS averaged 14 million viewers (8.8 household rating, 14 share), while ABC lagged with 9.6 million viewers (6.0 rating, 10 share). Right behind was NBC with 9.4 million viewers (6.2 rating, 10 share).

Fox had 5.7 million viewers (3.5 rating, 6 share), while UPN had 3.6 million viewers (2.4 rating, 4 share), the WB 3.1 million viewers (2.1 rating, 3 share), and Pax TV 570,000 viewers (0.4 rating, 1 share).

In the evening news race, NBC’s “Nightly News” won as usual, averaging 10.5 million viewers (7.2 rating, 13 share). ABC’s “World News Tonight” had 9.4 million viewers (6.4 rating, 12 share). The “CBS Evening News” had 8.3 million (5.7 rating, 11 share).

A ratings point represents 1,102,000 households, or 1 percent of the nation’s estimated 110.2 million TV homes. The share is the percentage of in-use televisions tuned to a given show.

For the week of Dec. 5-11, the top 10 shows, their networks and viewerships: “CSI: Crime Scene Investigation,” CBS, 30.9 million; “Without a Trace,” CBS, 21.8 million; “Survivor: Guatemala” (Season Finale Special), CBS, 21.2 million; “Survivor: Guatemala,” CBS, 20.2 million; “60 Minutes,” CBS, 19.7 million; “Law & Order: Special Victims Unit,” NBC, 16.3 million; “Grey’s Anatomy,” ABC, 15.7 million; “A Charlie Brown Christmas,” ABC, 15.3 million; “ER,” NBC, 15.3 million; “CSI: Miami,” CBS, 15.3 million.